Imagine for a minute that the Moon is held in its orbit about the Earth by electrical forces rather than by gravitation. What electrical charges -Q on the Earth and +Q on the Moon are necessary to hold the Moon in a circular orbit with a period of 27.3 days? The Earth-Moon distance is 384 000 km and the mass of the Moon is 7.35 × 10^22 kg
Q = 5.73 × 10^13 C
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If you represented each star by a grain of sand, how much sand would it take to represent all the stars in the universe?
A) all the sand in a typical playground sandlot B) all the sand on Miami Beach C) all the sand on the beaches of California D) all the sand on the beaches in the United States E) more than all the sand on all the beaches on Earth
A Carbon-14 nucleus decays to a Nitrogen-14 nucleus by beta decay. How much energy (in MeV) is released if Carbon-14 has a mass of 14.003074 u and Nitrogen-14 has a mass of 14.003242 u?
What will be an ideal response?
Blue stragglers are among the first stars formed in a cluster
Indicate whether the statement is true or false
The relative brightness of the stars as we see them in our sky is represented by their
A. luminosity. B. absolute magnitude. C. apparent magnitude. D. surface temperature.